Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d35e894daaf0e0d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 11:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f77b6c1d5ab5423a052b1ea65199a99 SHA-1: 922f3208cb7a9b21546fe2b566c1e2ca48a0c6e0 SHA-256: 7d35e894daaf0e0d9611288e7b02a5f766cd3bebe2415027e9ec3d226f252687
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing a link farm, with multiple URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/aiikaqc6na2ura7qdlt2ect9cu/juzibupetajafutafigog.pdf In PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/p4o8eb9fq1dehekslams60kopm/10576531588.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/37957976518.pdfIn PDF document text
    • https://slotpt2.com/contents/files/jejijenaxolovoturuje.pdfIn PDF document text
    • http://minerva-collection.net/files/files/wekoxepibofikolanebor.pdfIn PDF document text
    • http://prota.ru/upload/files/kuzaravazijotifexaji.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/75395466674.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/42577984823.pdfIn PDF document text
    • http://hingliltd.com/userfiles/93644224027.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd222ccb0e---70983027324.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/60077117951.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/dovagukaximiluvedamuwomu.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/40115138119.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/72459068754.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/37984193760.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/bugumiliviwurovimopabexed.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/ririkugurinevigop.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/5418731155.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4edd638b3bcc71c7470cd7ee5817c05b/robazoxobedekotod.pdfIn PDF document text
    • https://mar3ol.com/Files/files/58151919100.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/siwudomodigijube.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/boxinobesuluxujukaguruj.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/rifipotukutuwoseza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gallery+app+lock+pro+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 10152 bytes
SHA-256: 63308b0a3a8a1140f43b00dd23f2d70393ac0f69625caea5a4748fc8069de27b
font_01_sfnt_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 20440 bytes
SHA-256: 9ba42d7204cbeb777a64f2c6f174202a9e182e879ea36e70d2a35e4bb45a93bb
font_02_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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